US Bridges

County Route 602 over Back Brook

Fair

Hunterdon County, New Jersey · 0.05MI East of Dutch Lane · Structure no. 1000117

Built
2010
15 years old
Condition
Fair
inspected March 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
51 ft
1 main span
Daily traffic
2,637
2023 count
Owner
County
County Highway Agency

About this bridge

County Route 602 over Back Brook is a prestressed concrete box beam or girders - multiple carrying County Route 602 over Back Brook in Hunterdon County, New Jersey. It was built in 2010, so it is 15 years old, younger than the New Jersey average of 58.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 2,637 vehicles a day, roughly 3% of them trucks, projected to reach 3,218 by 2043. The structure is 51 ft (15.5 m) long and 40 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesCounty Route 602
CrossesBack Brook
Location0.05MI East of Dutch Lane
RouteCounty Highway 602
CountyHunterdon County
StateNew Jersey
Coordinates40.42928, -74.84811
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating110.1 US tons
Inventory rating73 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length51 ft (15.5 m)
Longest span46 ft (14 m)
Deck width40 ft (12.1 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,637 (2023)
Projected traffic3,218 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was County Route 602 over Back Brook built?

It was built in 2010, making it 15 years old in 2025.

What condition is County Route 602 over Back Brook in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in March 2023.

How much traffic does County Route 602 over Back Brook carry?

About 2,637 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is County Route 602 over Back Brook?

The structure is 51 ft (15.5 m) long with a longest span of 46 ft (14 m) and a deck 40 ft wide.

Who owns County Route 602 over Back Brook?

It is owned by the County Highway Agency.